HP Windows partition encrypted somehow, how to access?

HP Windows partition is encrypted somehow, how can i save my data from there after partial hdd crash (Windows won't boot)? This is something default from factory. Whole Windows partition looks like "Unformatted RAW" both to HP's own Recovery Console, or when connected to any other computer. Never seen anything like this before on other brands.

HP won't boot to Windows, not even display F8 menu (anymore,this was possible some time ago, seems like the hdd is slowly going worse).

I can still boot to HP Recovery Manager winpe environment through BIOS menu selection F11, and land in X:\Windows\RM .

All other partitions are visible, except for Windows system partition (ordinarily C:, now D: ), which is Unformatted RAW. Diskpart complains of IO error if trying to select that partition.

BCDEdit shows strange entry in {bootmgr}
customactions 0x5400000f
custom: 5400000f {2cf7d804-93b7-11de-8c90-83edb5a9cf68}
could this be some kind of HP encryption system?

It's not a BIOS password (other partitions are visible) or Bitlocker (Win 7 Home Starter originally), nothing wrong with MBR either. How can i check for presence of HP Protect Tools, and more importantly overcome them when disk is mounted to another computer for recovery?

Use of encryption is puzzling, because this is just a home netbook, not a biz comp.